I decided to start the routine from Christian's article, "Mutant Transformation - Part 1." The objective of this phase was "to increase muscle mass while maintaining the same amount of body fat," - my same goal for the next 6-7 months.
Here's what I need help with: why is it required to rest for a specific amount of time on certain exercises, then go back to the exercise you just completed and do the same number of sets again? For example, on Monday's routine, after 3 sets of 10 reps on decline cable pullovers, it says to rest 120 seconds before going back to decline cable pullovers and repeating for 3 sets before moving on to the next exercise. How is the method described in the article different than simply doing 6 sets of 10 reps on this exercise?